fix some compile errors

src/bitmap.c

@@ -2,7 +2,7 @@
 #include <string.h>
 #include "bitmap.h"
 
-PBITMAP BMP_Create(INT32 width, INT32 height, const VOID *bits)
+PBITMAP BMP_Create(INT32 width, INT32 height, const void *bits)
 {
   PBITMAP rc;
   UINT32 tot_size = sizeof(BITMAP) + (width * height * sizeof(UINT16));